package com.gxa.saas.controller;

import com.gxa.saas.utils.JsonResult;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.http.HttpServletRequest;
import java.io.File;
import java.io.IOException;
import java.util.Map;
import java.util.UUID;

/**
 * @author wanghai
 * @date 2022/6/7 14:22
 */
@RestController
public class UploadController {
    @PostMapping("/upload")
    public String upload(@RequestParam("file") MultipartFile multipartFile, HttpServletRequest request) throws IOException {
        //QQ截图20200724153059.png
        String originalFilename = multipartFile.getOriginalFilename();
        System.out.println("originalFilename:" + originalFilename);
        // 从原始文件名中获取后缀,作为新添加的文件的文件名后缀(匹配)
        String subfix = originalFilename.substring(originalFilename.indexOf(".") + 1);
        System.out.println("subfix:" + subfix);
        //使用UUID作为文件名,保证服务器中存放的文件名唯一
        String targetFile = UUID.randomUUID().toString().replace("-", "") + "." + subfix;
        System.out.println("targetFile:" + targetFile);
        // 通过request获取当前程序的根路径"/"
        String path = request.getSession().getServletContext().getRealPath("/");
        // 通过绝对路径
        //String path =("E:");
        String fileName = path + "/images/uploadImg/" + targetFile;
        System.out.println("fileName:" + fileName);
        // 构建文件对象
        File uploadFile = new File(fileName);
        //核心操作(含有异常操作, 利用异常设定状态码(和前端约定)
        // 此处应当和ExceptionController结合, 当try执行成功则设定状态码0
        // 出现异常则设定其他
        // 再将异常信息结合BusinessException抛出, 交给ExceptionController处 理
        try {
            multipartFile.transferTo(uploadFile);
        } catch (IOException e) {
            e.printStackTrace();
            throw e;
        }
        return targetFile;
    }
}
